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-rw-r--r--libguile/load.c343
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diff --git a/libguile/load.c b/libguile/load.c
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-/* Copyright (C) 1995,1996 Free Software Foundation, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this software; see the file COPYING. If not, write to
- * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- * As a special exception, the Free Software Foundation gives permission
- * for additional uses of the text contained in its release of GUILE.
- *
- * The exception is that, if you link the GUILE library with other files
- * to produce an executable, this does not by itself cause the
- * resulting executable to be covered by the GNU General Public License.
- * Your use of that executable is in no way restricted on account of
- * linking the GUILE library code into it.
- *
- * This exception does not however invalidate any other reasons why
- * the executable file might be covered by the GNU General Public License.
- *
- * This exception applies only to the code released by the
- * Free Software Foundation under the name GUILE. If you copy
- * code from other Free Software Foundation releases into a copy of
- * GUILE, as the General Public License permits, the exception does
- * not apply to the code that you add in this way. To avoid misleading
- * anyone as to the status of such modified files, you must delete
- * this exception notice from them.
- *
- * If you write modifications of your own for GUILE, it is your choice
- * whether to permit this exception to apply to your modifications.
- * If you do not wish that, delete this exception notice.
- */
-
-
-#include <stdio.h>
-#include "_scm.h"
-#include "libpath.h"
-#include "fports.h"
-#include "read.h"
-#include "eval.h"
-#include "throw.h"
-
-#include "load.h"
-
-#include <sys/types.h>
-#include <sys/stat.h>
-
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif /* HAVE_UNISTD_H */
-
-#ifndef R_OK
-#define R_OK 4
-#endif
-
-
-/* Loading a file, given an absolute filename. */
-
-/* Hook to run when we load a file, perhaps to announce the fact somewhere.
- Applied to the full name of the file. */
-static SCM *scm_loc_load_hook;
-
-SCM_PROC(s_primitive_load, "primitive-load", 1, 2, 0, scm_primitive_load);
-SCM
-scm_primitive_load (filename, case_insensitive_p, sharp)
- SCM filename;
- SCM case_insensitive_p;
- SCM sharp;
-{
- SCM hook = *scm_loc_load_hook;
- SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename,
- SCM_ARG1, s_primitive_load);
- SCM_ASSERT (hook == SCM_BOOL_F
- || (scm_procedure_p (hook) == SCM_BOOL_T),
- hook, "value of %load-hook is neither a procedure nor #f",
- s_primitive_load);
-
- if (hook != SCM_BOOL_F)
- scm_apply (hook, scm_listify (filename, SCM_UNDEFINED), SCM_EOL);
-
- {
- SCM form, port;
- port = scm_open_file (filename,
- scm_makfromstr ("r", (scm_sizet) sizeof (char), 0));
- while (1)
- {
- form = scm_read (port, case_insensitive_p, sharp);
- if (SCM_EOF_VAL == form)
- break;
- scm_eval_x (form);
- }
- scm_close_port (port);
- }
- return SCM_UNSPECIFIED;
-}
-
-
-/* Builtin path to scheme library files. */
-#ifdef SCM_PKGDATA_DIR
-SCM_PROC (s_sys_package_data_dir, "%package-data-dir", 0, 0, 0, scm_sys_package_data_dir);
-SCM
-scm_sys_package_data_dir ()
-{
- return scm_makfrom0str (SCM_PKGDATA_DIR);
-}
-#endif /* SCM_PKGDATA_DIR */
-
-
-/* Initializing the load path, and searching it. */
-
-/* List of names of directories we search for files to load. */
-static SCM *scm_loc_load_path;
-
-/* List of extensions we try adding to the filenames. */
-static SCM *scm_loc_load_extensions;
-
-/* Initialize the global variable %load-path, given the value of the
- SCM_SITE_DIR and SCM_LIBRARY_DIR preprocessor symbols and the
- SCHEME_LOAD_PATH environment variable. */
-void
-scm_init_load_path ()
-{
- SCM path = SCM_EOL;
-
-#ifdef SCM_LIBRARY_DIR
- path = scm_cons2 (scm_makfrom0str (SCM_SITE_DIR),
- scm_makfrom0str (SCM_LIBRARY_DIR),
- path);
-#endif /* SCM_LIBRARY_DIR */
-
- {
- char *path_string = getenv ("SCHEME_LOAD_PATH");
-
- if (path_string && path_string[0] != '\0')
- {
- char *scan, *elt_end;
-
- /* Scan backwards from the end of the string, to help
- construct the list in the right order. */
- scan = elt_end = path_string + strlen (path_string);
- do {
- /* Scan back to the beginning of the current element. */
- do scan--;
- while (scan >= path_string && *scan != ':');
- path = scm_cons (scm_makfromstr (scan + 1, elt_end - (scan + 1), 0),
- path);
- elt_end = scan;
- } while (scan >= path_string);
- }
- }
-
- *scm_loc_load_path = path;
-}
-
-
-/* Search %load-path for a directory containing a file named FILENAME.
- The file must be readable, and not a directory.
- If we find one, return its full filename; otherwise, return #f.
- If FILENAME is absolute, return it unchanged. */
-SCM_PROC(s_sys_search_load_path, "%search-load-path", 1, 0, 0, scm_sys_search_load_path);
-SCM
-scm_sys_search_load_path (filename)
- SCM filename;
-{
- SCM path = *scm_loc_load_path;
- SCM exts = *scm_loc_load_extensions;
- char *buf;
- int filename_len;
- int max_path_len;
- int max_ext_len;
-
- SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename,
- SCM_ARG1, s_sys_search_load_path);
- SCM_ASSERT (scm_ilength (path) >= 0, path, "load path is not a proper list",
- s_sys_search_load_path);
- SCM_ASSERT (scm_ilength (exts) >= 0, exts,
- "load extension list is not a proper list",
- s_sys_search_load_path);
- filename_len = SCM_ROLENGTH (filename);
-
- /* If FILENAME is absolute, return it unchanged. */
- if (filename_len >= 1
- && SCM_ROCHARS (filename)[0] == '/')
- return filename;
-
- /* Find the length of the longest element of path. */
- {
- SCM walk;
-
- max_path_len = 0;
- for (walk = path; SCM_NIMP (walk); walk = SCM_CDR (walk))
- {
- SCM elt = SCM_CAR (walk);
- SCM_ASSERT (SCM_NIMP (elt) && SCM_ROSTRINGP (elt), elt,
- "load path is not a list of strings",
- s_sys_search_load_path);
- if (SCM_LENGTH (elt) > max_path_len)
- max_path_len = SCM_LENGTH (elt);
- }
- }
-
- /* Find the length of the longest element of the load extensions
- list. */
- {
- SCM walk;
-
- max_ext_len = 0;
- for (walk = exts; SCM_NIMP (walk); walk = SCM_CDR (walk))
- {
- SCM elt = SCM_CAR (walk);
- SCM_ASSERT (SCM_NIMP (elt) && SCM_ROSTRINGP (elt), elt,
- "load extension list is not a list of strings",
- s_sys_search_load_path);
- if (SCM_LENGTH (elt) > max_ext_len)
- max_ext_len = SCM_LENGTH (elt);
- }
- }
-
- SCM_DEFER_INTS;
-
- buf = scm_must_malloc (max_path_len + 1 + filename_len + max_ext_len + 1,
- s_sys_search_load_path);
-
- /* Try every path element. At this point, we know it's a proper
- list of strings. */
- for (; SCM_NIMP (path); path = SCM_CDR (path))
- {
- SCM path_elt = SCM_CAR (path);
-
- /* Try every extension. At this point, we know it's a proper
- list of strings. */
- for (exts = *scm_loc_load_extensions;
- SCM_NIMP (exts);
- exts = SCM_CDR (exts))
- {
- SCM ext_elt = SCM_CAR (exts);
- int i;
-
- /* Concatenate the path name, the filename, and the extension. */
- i = SCM_ROLENGTH (path_elt);
- memcpy (buf, SCM_ROCHARS (path_elt), i);
- if (i >= 1 && buf[i - 1] != '/')
- buf[i++] = '/';
- memcpy (buf + i, SCM_ROCHARS (filename), filename_len);
- i += filename_len;
- memcpy (buf + i, SCM_ROCHARS (ext_elt), SCM_LENGTH (ext_elt));
- i += SCM_LENGTH (ext_elt);
- buf[i] = '\0';
-
- {
- struct stat mode;
-
- if (stat (buf, &mode) >= 0
- && ! (mode.st_mode & S_IFDIR)
- && access (buf, R_OK) == 0)
- {
- SCM result = scm_makfromstr (buf, i, 0);
- scm_must_free (buf);
- SCM_ALLOW_INTS;
- return result;
- }
- }
- }
- }
-
- scm_must_free (buf);
- SCM_ALLOW_INTS;
- return SCM_BOOL_F;
-}
-
-
-SCM_PROC(s_primitive_load_path, "primitive-load-path", 1, 2, 0, scm_primitive_load_path);
-SCM
-scm_primitive_load_path (filename, case_insensitive_p, sharp)
- SCM filename;
- SCM case_insensitive_p;
- SCM sharp;
-{
- SCM full_filename;
-
- SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename,
- SCM_ARG1, s_primitive_load_path);
-
- full_filename = scm_sys_search_load_path (filename);
-
- if (SCM_FALSEP (full_filename))
- {
- int absolute = (SCM_LENGTH (filename) >= 1
- && SCM_ROCHARS (filename)[0] == '/');
- scm_misc_error (s_primitive_load_path,
- (absolute
- ? "Unable to load file %S"
- : "Unable to find file %S in load path"),
- scm_listify (filename, SCM_UNDEFINED));
- }
-
- return scm_primitive_load (full_filename, case_insensitive_p, sharp);
-}
-
-/* The following function seems trivial - and indeed it is. Its
- * existence is motivated by its ability to evaluate expressions
- * without copying them first (as is done in "eval").
- */
-
-SCM_SYMBOL (scm_end_of_file_key, "end-of-file");
-
-SCM_PROC (s_read_and_eval_x, "read-and-eval!", 0, 3, 0, scm_read_and_eval_x);
-
-SCM
-scm_read_and_eval_x (port, case_insensitive_p, sharp)
- SCM port;
- SCM case_insensitive_p;
- SCM sharp;
-{
- SCM form = scm_read (port, case_insensitive_p, sharp);
- if (form == SCM_EOF_VAL)
- scm_ithrow (scm_end_of_file_key, SCM_EOL, 1);
- return scm_eval_x (form);
-}
-
-
-
-void
-scm_init_load ()
-{
- scm_loc_load_path = SCM_CDRLOC(scm_sysintern("%load-path", SCM_EOL));
- scm_loc_load_extensions
- = SCM_CDRLOC(scm_sysintern("%load-extensions",
- scm_listify (scm_makfrom0str (""),
- scm_makfrom0str (".scm"),
- SCM_UNDEFINED)));
- scm_loc_load_hook = SCM_CDRLOC(scm_sysintern("%load-hook", SCM_BOOL_F));
-
-#include "load.x"
-}